Entering floating numbers

Hi,

I'm trying to write a little program that will help me calculate minority and majority carriers in semiconductors based on my input. The program should handle large numbers, typically around 10^12-10^17.

However, I'm stuck on the very start:

Code:

---


#include <stdio.h>

int main() {

        double d=0;

        scanf("%e", &d);
        printf("%e\n", d);

        return 0;

}

---

I'm sure something is wrong with this code, but what? For example, when I type in 15, it prints out 5.424145e-315.

Code:

---

#include <stdio.h>

int main() {

double d=0;

scanf("%le", &d);
printf("%e\n", d);

return 0;

}

---

%e is the same as %f which is for float. %le makes it a double (at least on gcc)